The core anatomy 4 LAPISAN CORE 1. TRANSVERSE ABDOMINIS (deepest): korset alami spine, stabilizer utama 2. INTERNAL OBLIQUES: rotation dan lateral flexion 3. EXTERNAL OBLIQUES: rotation dan lateral flexion (opposite direction) 4. RECTUS ABDOMINIS (surface): six-pack, flexion movement Yang harus aktif di setiap pose stabilizing: TRANSVERSE ABDOMINIS Bukan bracing (rectus). Bukan clenching (obliques). Ini stabilizing engagement yang subtle tapi powerful. The 3 drills